Inside Out Library · Explore
The effect of staggering a biplane (1921)
NASA Technical Reports Server (NTRS) · leaf 6
-100 Percent Staler Fig. 3 Stagger Test GD vs. Stagger.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
More pictures from The effect of staggering a biplane
More like this